Question

1.A method of estimating size of a molecule is:

2. A method of estimating mass of a molecule is:

3. A method of estimating mass of a heavenly body is:

Answer 1

1) Oil film analysis.

2) Mass spectrometry

3) By using spectroscopy method, we can calculate the mass, age, composition, year of the heavenly bodies, from red shift way. (Kepler's third law)

Please note that there are other methods also.
I am simply quoting a method for each.
Hope this helps.
Good luck.
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